Sewing machine



Nov., 28, i944. N. v. cHRlsTr-:Nsx-:N ET AL. 2,353,774

SEWING MACHINE Filed March ll, v1941 7 Sheets-Sheet l w1 TNESSES; L X WL INVENTORS: Aff/maiz l'lzrims'ezz, 'or Sauer @MMM BY 4 ed hzmbezy,

Nov. 28, 1944. N. v. cHRlsrENsEN ET AL 2,353,774

SEWING MACHINE Filed March 11 1941 '7 Sheets'PSheet 2 IIHII Nov. 28,1944- N. v. cHRlsTENsEN ET Al. 2,353,774

SEWING MACHINE Nov. 28, 1944- N. v. cHRlsTENsEN ET AL SEWING MACHINEFiled March ll, 1941 7 Sheets-Sheet 4 INVENTORSI Sauer @www ATTORNEYS.

Nov. 28, 1944. N. v. cHRlsTx-:NSEN ET Al. 2,363,774

SEWING MACHINE m n i 1.11:

v War/nmz Rume/1.5m, eor Sauer M MM BY cf. Wed Waglweiy,

Nov. 28, 1944. N. v. cHRlsTENsEN ET AL 2,363,774

SEWING MACHINE Filed March 1l, 1941 '7 Sheets-Sheet 6 ATTORNEYS.

'i l Nov. 28, 1944. N. v. CHRISTENSEN ET AL 2,353,774

SEWING MACHINE Filed March 1l, -1941 7 Sheets-Sheet 7 V) 3l yl 32 BY fp/Vmi man@ f @www Patenten INOV- 1544 UNITED STATES PATENT OFFICE SEWINGMACHINE Norman V. Christensen, Chicago, George Sauer,

Berwyn, and Ned Wallenberg, Chicago, Ill., assignors to Union SpecialMachine Company, Chicago, Ill., a corporation of Illinois ApplicationMarch 11, 1941, Serial No. 382,692

25 Claims.

of the parts required in the drive or actuating in Figs. 2, 8 and 9.mechanism relied upon for impartation of the Figs. 11-16 are detailviews showing successive necessary movements to the stitch-forming andpositions of the needle and the loopers of the feeding instrumentalitiesof the machine (as well machine in the performance of a stitch formingas to trimming devices if present) to eliminate cycle. as far aspossible the need for reciprocating parts l0 As herein illustrated ourimproved sewing maparticularly in the drive or actuating mechanism;chine has a box-like base I of generally rectanguand to enable, for thepurpose of self-lubrication, lar configuration with integral front, rearand enclosing of the drive or actuating mechanism in side walls 2, 3, 4and 5` and bottom 6, in which a housing of relatively small dimensions,with base a supply of lubricating oil is normally mainallocation howeverof the stitch-forming and tained at the level L. Bridging the front andrear feeding instrumentalites (and trimming instru- Walls 2 and 3 of thebase I intermediate the mentalities) externally of such housing, andwith side walls 4 and 5, is a relatively narrow horiprovision for thetransmission of motion to said zontal longitudinally-disposed plate-likeweb 1, instrumentalities from the actuating mechanism see Figs. 1, 2 and8, which partly closes the base to the exclusion of oil leakage from thehousing. at the top and which constitutes the mid-section In connectionwith a sewing machine having of the work support of the machine. Asshown in the above attributes, it is a further aim of our Figs. 6 and 8,the web 'I is extended as at 1a. invention to secure the desirableadvantages inbeyond the front wall 2 of the base I, and has herent tothe use of a straight needle bar which downwardly-recessed margins 8along its parallel is confined solely to endwise reciprocation.longitudinal side edges. The base I is otherwise Other objects andattendant advantages will closed by horizontal plates 9 and Ill, whichare appear from the following detailed description of DOSitiOned 170ODDOSte Sides 0f the Web 7 and the attached drawings, wherein completethe work support. As shown in Figs. Fig. 1 shows our improved sewingmachine in 1 and 2, the plates 9 and I0 are iiush with the plan with itstop cover removed. 30 top of the web 'I, and are upwardly recessed mar-Fig. 2 shows the front elevation of the maginally along their inneredges as at II to overchine with its top cover removed. lap thedownwardly-recessed margins 8 of said Fig. 3 is a fragmentary view ofthe machine web. Screws I2 and I3 respectively engaging in frontelevation with the top cover in place, downwardll7 IIGO Web 'I and theWalls 0f the base Fig. 4 shows the machine in front elevation 35 I serveto removabliT Seeure the plates 9 and I0 with a broken out portion insection taken as ih place With hteI'pOS'I/OH 0f Sealing gaskets atapproximately indicated by the angled arrows I4 and |5- FIOIh Fig. 1 itiS 'G0 he noted that the IV-IV in Figs. 6 and 1U. plate 9 at its frontend, extends somewhat be- Fig. 5 is a fragmentary view showing theleftyond the web 'I while the plate I0 is coextensive hand sideelevation of the machine with the top in length With Sad Web Sei? iIltOa Cut-01113 in cover in place. the inner edge of the plate 9 is a throatplate I6 i Fig. 6 shows the left-hand side elevation of of semi-Circularconfiguration which will be the machine with a broken out part insection again Iefelled t0 latertaken as indicated by the angled arrowsVI-VI The stitch forming mechanism of the machine in Figs. 2 and 4, andwith the top cover omitted. 45 includes a needle bar I8 which isinclined some- Fig. '7 shows the right-hand side elevation of what tothe vertical forwardly in the direction of the machine with portionsbroken out and with feeding which is indicated by the arrows in Figs.portions in section to better illustrate important 1 and 6. As shown inFigs. 1 and 4, the needle structural details and to expose certain partsat bar I8 is disposed in a vertical plane well to the the interior.right of the line A--A of feeding (Fig. 1), and Fig. 8 is a view in plansection taken as indipasses downward through the mid-section l of catedby the angled arrows VIII-VIII in Fig. 2, the work support into a hollowoffset or comand with portions broken away to expose underpartment I9 atthe front of the base I, said comlying parts. partment being set apartfrom the main compart- Fig. 9 is a transverse section of the machine 55ment or hollow 20 of the base by the front wall taken as approximatelyindicated by the angled arrows IX-IX in Figs. 1 and 8.

Fig. 10 is a longitudinal section taken as approximately indicated bythe angled arrows X-X 2 of the latter (Fig. 6) and by a partition 2|(Figs. 4 and 6). From Fig. 6 it will be further observed that the needlebar I8 is confined to endwise reciprocation in oil-tight bushings 22,23,

respectively, set into aligned bores in the web 1 and in the bottom 6 ofthe base, the lower bushing being secured against displacement by a setscrew 25 and closed at its lower end by a screw plug 26. Rotation of theneedle bar I8 is prevented through engagement of the lateral projection21 on a collar 28 secured to said bar, in a vertical slot between twoguide plates 2 9 aflixed to the wall 2 within the hollow of the offsetI9 of the base I, see Figs. 4 and 6. Adjustably secured to the top endof the needle bar I8 by a pair of set screws 30, is alaterally-extending arm 3|, which, in its end supports, with capacityfor endwise and rotative adjustment in the plane A-A (Fig. 1) ofstitching and feeding and in parallel relation to said bar, a sewingneedle 32.

The stitch-forming mechanism of the illustrated machine further includesa primary or under looper 35 which is external to the base I and whichcooperates with the needle 32 beneath the throat plate I6; and asecondary or overedge looper 36 which is also external to the base I,see Figs. 2, 4, '1 and 10. As shown, the loopers 35 and 36 are arrangedto operate crosswise of the direction of feeding. The under looper 35,see Figs. 4 and 10, is affixed to the outer end of a short horizontaloscillated shaft 31 which extends, with an oil-tight fit, into theinterior nf the base I, through a bearing boss 38 (Fig. 10) on the frontwall 2 of said base. At an intermediate point, the overedge looper 36has a. pivotal connection 39 (Fig. 4) with a lazy bar or arm 4f! securedto the outer end of a horizontal pin 4I which is journalled for freeoscillation in another oil-tight bearing boss 42 (Fig. 10) on the frontwall 2 of the base I, axial movement of said pin being prevented by athrust collar 43 at the inner end thereof. At its lower end, theoveredge looper 36 (Fig. 4) has a pivotal connection 44 with an arm 45at the outer end of a short horizontal oscillated shaft 46 which extendsinto the interior of the base I through another oil-tight bearing boss41 on the front wall 2. As shown in Figs. l and 4, the opposing sideedges of the web 1 and the throat plate I6 are complementarily notchedto provide a clearance opening 48 in the extended free or over-hangingportion of the work support through which opening the swinging outer endof the overedge looper 36 passes from beneath to a point above the worksupport around the edge E of fabric F (Fig. 1) operated upon in themachine.

For the purpose of intermittently progressing the fabric F on the worksupport relative to the needle 32, we utilize in the present instance amain feeding element in the form of a four motion feed dog 50 and anauxiliary four-motion differential feed dog I. The toothed portions ofthe feed dogs 50 and 5I operate upwardly through slots 52, in the throatplate I6, see Fig. 10, the differential dog operating in advance of themain dog to gather in the fabric to a predetermined extent (as desirablewhen knitted goods are worked in the machine to compensate for stretch)before it is presented to the needle 32. As shown in Figs. 8 and 10, theshanks of the feed dogs 50 and 5I extend horizontally inward into thebase through a shallow opening jointly formed by a` notch 53 in the topedge of the front wall 2, and the overlying plate section 9. Opposingthe feed dogs 50 and 5I from above is a presser foot 55 which ispivotally connected intermediate its ends at 56 to a supporting shankmember 51. As shown in Fig. 10, the shank member 51 is clamped at itsupper end to the pendant portion of a stud 58 at the front end of ahorizontal presser arm 59. At its rear end, the presser arm 59 issecured by a set screw 88 (Fig. 1) to one end of a transverse rock shaft6I which is journalled in laterally-spaced bearing lugs 62 and 63upstanding from the web 1. The presser foot 55 is yieldingly urgeddownwardly by a leaf spring 65 whereof one end is pierced to engage avertical anchorage stud 66 in an upright boss 61 on the top of the web1, and whereof the other end is bifurcated to similarly engage theupwardlyextending end of the stud 58 at the outer end of the presser arm59. Regulation of the spring 65 is effected through a hook block 68which embraces it at the center and which is adjustable up or down bymeans of thumb screw 69 whereof the shank threadedly engages downwardlyinto a boss on the top of the web 1. When desired or required tofacilitate introduction or withdrawal of the work beneath or frombeneath the presser foot, the latter may be lifted through the medium ofa control lever 10 (Figs. 1, 1 and 10) whereof the outer end is intendedto be connected by a drop link with a knee press or foot treadle, theselatter elements having been omitted from the drawings since they may beof any well known or approved construction.` The lever 1U is freelyfulcrumed on the end of the rock shaft 6I opposite that occupied by thepresser arm 59, and is subject to a torsion spring 12 which tends tomove it anti-clockwise in Fig. 1 so that it is normally maintained inengagement with an overhanging stop pin 13 in a post 14 rising from theweb 1 As shown in Fig. l, the spring 12 is coiled about the fulcrum bosson the lever 10, one of its ends being secured to an anchorage screw 15on the bearing lug 63 and its other end being hooked under said lever asat 18. Extending laterally from the fulcrurn boss of the lever 18 is alug 11 (Fig. '1), which, when said lever is depressed, engages adownward projection 18 o-n a collar 19 xedly clamped to the end of therock shaft 6I to turn the latter clockwise and thereby cause the presserarm 59 to be lifted for the purpose previously mentioned. As shown inFig. '7, a clearance ordinarily exists between the lug 11 and theprojection 18 so that the presser foot 55 may rise and fall normally asrequired without interference by the control lever 10.

In certain instances of practice, it is desirable to trim the edge ofthe fabric before such edge is stitched. We have accordingly providedour improved sewing machine with a trimming means for the explanation ofwhich reference will be had now more especially to Figs. 1, 4. '1, and10. As shown, this trimming means comprises a stationary ledger bladewhich lies in a plane slightly to the right of the line of stitching A-A(Fig. 1), and which is pitched forwardly at an Y acute angle to thevertical in the direction of feeding. The ledger blade 80 is secured,with provision for endwise adjustment, in a suitable nolder block 8| bya bolt 82, said holder block being shiftable transversely of a pendantlug 83 on the cover plate 9 for adjustment of the blade laterally of thestitching line A-A, and being fixable in shifted positions by a screw84. The upper end of the ledger blade 80 extends into the clearanceopening 48 in the work support of the machine and terminates in ahorizontal cutting edge 85, as best shown in Fig. 10. Cooperative withthe ledger blade 80 is a vertically-supported moving trimming blade 86having a horizontal cutting edge 81 at its bottom end to shear againstthe cutting edge 85 of said ledger blade, and also a pendant tongueextension 88 by which the two blades are maintained in cutting alignmentwhen in open position. At its upper end, the blade 81 is secured in ahead 89 at one end of a horizontal rod 90 which is non-rotatable butaxially slidable in laterally-spaced bearing bosses 9| and 92 at thefront end of a horizontal supporting arm 93, see Fig. 1. As shown thearm 93 parallels the presser arm 59 and is freely fulcrumed on the rockshaft 6I in the interval between the bearing lugs 62 and 63. A coiledspring 95 in compression between the boss 92 and a collar 96 on the rod90 yieldingly urges the latter leftward in Figs. 4 and 9 to maintain themoving blade 86 in shearing engagement with the ledger blade 80.

Suitable spring disk tensions 91, 98 and 99 (Fig. 1) are provided on thecover plate I0, respectively, for the needle and looper threads (notillustrated). En route from the tension 91 to the needle 32, the needlethread is passed through apertured pairs of opposing control fingers and|0|, respectively, mounted on the top of the web 1 and to the rear ofthe needle supporting arm.

The base I is utilized as a housing for actuating mechanism from whichthe various aforedescribed externally-located moving parts of themachine derive their movements, said mechanism including a pair oftransversely-extending parallel shafts |02 and |03 in the lower part ofthe base I. 5

As seen in Figs. 4 and 8, the shaft I 02 extends outward through abushed oil-tight bearing boss |05 on the right-hand side wall 5 of thebase I, and on its protruding end carries a combined hand and belt wheel|06 by which the machine may be driven either manually or under power.The other or left-hand end of the shaft |02 extends through a bushedbearing |01 on the partition 2| into the compartment or hollow of theoffset I9 at the front of the base I. Secured to the shaft |02 withinthe oiset I9 is a balanced crank member |08 with a crank pin |09 towhich is connected the lower end of a pitman I I 0 whereof the upper endis connected to a lateral stud I I on the collar 28 previously referredto. By the means just described, the rotary motion of the shaft |02 isconverted into endwise reciprocating movements of the bar I8 and thesupporting needle 32. As shown in Fig. 4, oil is permitted to flow fromthe compartment into the compartment I9 by way of a connecting duct II2at the bottom of the partition 2 I The moving parts within thecompartment I9 are automatically lubricated by oil splash induced byintermittent dipping of a spoon ||3 at the bottom end of the pitman intothe oil supply. The companion shaft |03 is journalled adjacent itsright-hand end in a bearing boss |I4 upstanding from the bottom 6 of thebase I, while its left-hand end is rotatively supported in a bushedoil-tight bearing I|5 on the left side wall 4 of said base. The shaft|03 is driven in unison with the shaft |02 but in the opposite directionthrough a pair of similar connecting intermeshing spur pinions IIE andIIT. Mounted on the shaft I 03 about midway between the gear ||1 and thebearing ||5 (Figs. 8 and 9) is a rotary eccentric actuator I IB, which,through a vertical pitman ||9 is coupled with a ball arm |20 on theinner end of the oscillating shaft 31 of `the primary or under looper35. Immediately `to the left of the rotary eccentric actuator II8 isanother rotary actuator I2| which is in turn connected to a ball arm |22at the inner end of the oscillating shaft 46 for the secondary oroveredge looper 36 through a vertical pitman |23. Lift movements areinduced in the feed dogs 50 and 5| through a vertical pitman |26, from athird rotary eccentric actuator |25 mounted on the shaft |03 immediatelyto the right of the bearing boss I I5. At its upper end, the pitman |26is connected to a headed screw stud |21 (Figs. 8 and 10) at the frontend of the horizontal carrier bar |28 on which the main feed dog 50 ismounted, the rear end of said bar being pivotally connected at |29 tothe upper end of a bifurcated upright rocker |30 on a horizontal rockshaft |3| within the base at the rear and about midway of the height ofthe latter. The feed rock shaft I3| is journalled in three spaced bushedbearings I32, |33 and |34 (Fig. 8), the rst of these being on theleft-hand end wall 4 of the base and the 4other two projecting forwardlyfrom the rear wall 3. Horizontal to and fro or feed movements areimparted to the main feed dog from a rotary actuator |35 on theright-hand end of the shaft |03 adjacent the bearing II4, see Figs. 7, 8and 9. As shown, the rotary actuator |35 has a crank pin |36 which isadjustable by means of a screw |31 for the purpose of varying the feedstroke of the feed dogs 50, 5|, the movements of said rotary actuatorbeing converted into oscillatory movements of the feed rock shaft |3| asa consequence of the connection of the crank pin with aforwardly-extending arm |38 at the right-hand end of said shaft. Theshank of the differential feed dog 5| (Fig. 10) is secured by a clampscrew |39 to one end of a horizontal rod |40 which is slidable endwisein spaced guide lugs I4I on the main feed bar |28. A collar |42 fast onthe rod |40 in the interval between the guide lugs |4| has a lateralpivot stud |43 for connection of the forward end of a link |45. Theother end of the link is pivotally connected to a block |46 which isadjustable along an arcuate slot |41 in a lever plate |48 secured to oneof the side arms of the feed rocker |30. Through this means,differential horizontal to and fro or feed movements are imparted to thedifferential feed dog 5 I. The coupling or coordination of the main anddiiferential feed dogs in the manner just explained is well known andtherefore, per se, forms no part of our invention.

The supporting arm 93 of the moving trimming blade 81 is vibrated up anddown by a fth rotary eccentric actuator |50 (Fig. 9) on the shaft |03 inthe interval between the gear pinion ||1 and the rotary actuator ||8.Extending up from the rotary actuator |50 is a vertical pitman |5| whichpasses through an opening |52 in the web 1 and at its upper end isconnected to a stud |53 projecting laterally from the cutter arm 93 at apoint intermediate the ends of the latter. An oil seal is maintained atthe orifice |52 by a group of washers |55 (Figs. 4 and 7) the uppermostone of which is caused to bear against a considerable margin around theorifice at the under side of the web under the influence of anupwardlypressing nger spring |56, said washers having a snug sliding fitwith the intermediate cylindric rod portion of the pitman I5I.

For the most part, the moving elements withinthe chamber or hollow 20 ofthe base I are lubricated by splash oil dispersed by the gear pinionsIIB, I1 and by spoon projections |51, |58, |59 and |60 at the lower endsof the pitmans IIS,

|23, 26 and 5|, which pinions and projections dip into the oil supply asclearly shown in Fig. 9. That portion of the oil thrown up by the gearpinions ||6, ||1 and impinging upon the under side of the cover plate Iis directed by crossed ns |6| on said cover into an underlying reservoir|62 secured to the side wall 5 of the base by a screw |63. The oilcollected in the reservoir |62 is conducted by means of tubes |65, |66and |61, respectively, to the ball arms |20, |22 on the looper shafts31, 46 and to the rotary actuator |35. A cylindrical block |68 oftransparent material with a Abeveled bottom end face |69 extends downthrough an opening in the cover plate I0 to the bottom of the base I andserves as a directreading sight gauge by which the oil supply level maybe checked from time to time. This oil gauge forms the subject of aco-pending application Serial No. 377,499 led on May 2'1, 1940, byGeorge Sauer.

The parts within the base I are accessible from above upon removal ofthe plates 9 and I0. An additional removable closure plate |10 over anopening in the side wall 5, (Figs. 8 and 9) makes possible access to therotary actuator |35 for the purposes o-f ready inspection or adjustment.The parts within the offset I9 are in turn accessible by way of frontand side openings covered by removable closure plates I1| and |12, seeFigs. 2, 4, 6 and 10.

For the protection ofthe parts above the work support and to safeguardthe operator from possible injury by contact with them, we have providedthe machine with a comparatively shallow cover |15, see Figs. l, 3, 5,and 10, which, at the center of its rear edge, is connected to the web 1by a hinge |16 so that it may be swung upward and rearward when accessto said parts is desired or required. At the center of its front edge,the cover is fitted with a grasp knob |11, and also with a spring keeper|18 which is normally in yielding restraining engagement with a springhold down catch |19. As shown in Figs. 3 and 5, ample clearance |80 isallowed beneath the left-hand side wall and beneath contiguous portionsof the front and rear walls of the cover |15 to enable the operator tosee the needle 32 and the presser foot 55 in guiding the right-hand edgeof the fabric which is to be trimmed and over-edged, and to enablepassage of the fabric rearward over the work supporting plate 9.

The operative cycle of the stitch-forming elements is shown in Figs.11-16. In Fig. 11, the needle 32 has reached its lowermost position,while the under looper is moving forward in readiness to take the needlethread loop (not shown) and the overedge looper 36 is still retreating.In Fig. 12 the under looper 35 is in the position of engaging the needlethread loop just as the needle 32 has begun to rise; while the overedgelooper has reached the limit of its retractive stroke. In Fig. 13 theoveredge loo-per 36 has passed beyond the path of the under looper 35 inreadiness to carry its own thread loop (not shown) up and around theedge of the fabric, while the needle 32 continues in its ascent. In Fig.14, the under looper `35 has started to retreat, the needle has reachedthe upper limit of its stroke, and the overedge looper 36 is movingupward and laterally into the path of the needle 32. In Fig, 15, theneedle has begun its downward stroke and is in position to enter thethread loop (not shown) presented to it by the overedge looper 36. Fig.16 shows the needle 32 continuing its downward movement and ispenetrating the fabric, the overedge looper 36 retreating, and the underlooper advancing toward the needle.

Having thus described our invention, we claim:

1. In a sewing machine, a hollow box-like base containing a supply oflubricating oil and closed at the top; a flat horizontal work supportassociated with the base; an endwise-reciprocating needle bar extendingup from within the base through an oil-tight bearing in the top of thebase; a needle carried by the protruding end of the bar for movement onits work-penetrating stroke down through the work support; a looper tocooperate with the needle beneath the work support; actuating mechanismwithin the base from which the needle bar and the looper derive theirmovements in properly timed relation; and means for lubricating theactuating machanism from the oil supply within the b'ase.

2. A sewing machine according to claim 1, wherein the base is subdividedinto two compartments, one into which the needle bar extends, and one inwhich the actuating mechanism is housed; and wherein an operatingconnection extends through a dividing wall from the actuating mechanismin the last mentioned compartment to needle bar operating mechanism inthe first mentioned compartment.

3. In a sewing machine, a hollow box-like base containing a supply oflubricating oil and closed at the top; a hat horizontal work supportassociated with the base; an endwise-reciprocating needle bar extendingup from within the base through an oil-tight bearing in the top of thebase; a needle carried by the protruding end of the bar for movement onits work penetrating stroke down through the work support; a looperexteriorly of the base to cooperate with the needle in stitch formationbeneath the work support; an operating shaft for the looper extendingthrough an oil-tight bearing into the interior of the base; actuatingmechanism within the base from which the needle bar and the looperoperating shaft derive their movements in properly timed relation; andmeans for lubricating the mechanism from the oil supply within the base.

4. A sewing machine according to claim 1, wherein the actuatingmechanism includes a pair of gear-connected shafts from one of which theneedle operating mechanism is actuated, and from the other of which thelooper is actuated; and wherein one of the gear-connected shafts extendsto the exterior through an oil-tight bearing in the base and on itsprotruding end carrie a drive wheel.

5. A sewing machine according t0 claim 1, wherein the base is subdividedinto two compartments, one into which the needle bar extends and one inwhich the actuating mechanism is housed; and wherein the actuatingmechanism includes a pair of horizontal gear-connected shafts from oneof which the looper is actuated, and the other of which extends througha dividing partition into the first mentioned compartment; a crank onthe latter shaft within said first mentioned compartment; and a pitmanconnecting the crank with the needle bar.

6. A sewing machine according to claim 3, wherein the actuatingmechanism includes a pair of inter-geared shafts from one of which theneedle bar is actuated and from the other of which the looper isactuated; and further including a second looper exteriorly of the baseto cooperate with the rst looper and the needle in the formation ofoveredge stitching; and a separate shaft for oscillating the secondlooper also extending through an oil-tight bearing into the interior ofthe base for actuation with said first looper from the second of the twointergeared shafts.

7. A sewing machine according to claim 3, wherein a portion of the worksupport extends beyond the base; wherein the needle passes through theextended portion of the work support; and wherein the looper cooperateswith the needle beneath said extended portion of the work support.

8. A sewing machine according to claim 3, wherein a second looperexteriorly of the base cooperates with the first looper and the needlein the formation of overedge stitching; wherein a separate shaft foroscillating the second looper also extends through an oil-tight bearinginto the interior of the base for actuation from the actuatingmechanism; wherein a portion of the work support extends beyond thebase; wherein the rst looper coacts with the needle below the extendedportion of the work support; and wherein the second looper in itsmovements passes through an opening in the extended portion of the worksupport from beneath the latter to a point above it and vice versa.

9. A sewing machine according to claim 3, wherein a portion of the worksupport extends beyond the base; wherein a feed element operatesupwardly through an aperture in the overhanging portion of the worksupport; wherein operating connections for the feed element extendthrough a wall of the base to the interior for actuation from theactuating mechanism; and wherein a presser element cooperates with thefeed element above the work support.

10. A sewing machine according to claim 3, wherein the actuatingmechanism includes a pair of inter-geared horizontal shafts from one ofwhich the needle bar is actuated, and from the other of which the looperis actuated; wherein a portion of the work support extends beyond thebase; wherein a` four-motion feed dog operates through a slot in theextended portion of the work support; wherein the feed and liftmovements are imparted to the feed dog through connections interiorly ofthe base with the second mentioned shaft of the actuating mechanism; andwherein a presser foot reacts upon the feed dog from above the worksupport.

11. A sewing machine accordingto claim 3, wherein a portion of the worksupport extends beyond the base; wherein an intermittent feeding elementoperates at the overhanging portion of the work support to progress thework relative to the needle; and wherein a trimming means operates totrim the work in advance of the needle, said trimming means including aledger blade secured within an opening in the extended portion of thework support, a coacting movable blade, a horizontal arm fulcrumed forup and down movement above the work support and carrying the movableblade, and an operating rod extending down through an oilsealed openingin the base top from the arm to the interior of the base for actuationfrom the actuating mechanism.

12. A sewing machine according to claim 3, wherein a portion of the worksupport extends beyond the base; wherein an intermittent feeding elementoperates at the overhanging portion of the work support to progress thework relative to the needle; wherein the actuating mechanism includes apair of inter-geared horizontal shafts from one of which the needle barl is actuated, and from the other of which the loop.

er is actuated; and wherein a trimming means operates to trim the workin advance of the needle, said trimming means including a ledger bladesecured within an opening in the extended portion of the work support, acoacting movable blade, a horizontal arm fulcrumed for up and downmovement above the work support and carrying the movable blade, and anoperating rod extending down through an oil-sealed openf ing in the basetop from the arm to the interior of the base for actuation from thesecond mentioned shaft of the actuating mechanism.

13. A sewing machine according to claim 3, wherein the actuatingmechanism includes a pair of inter-geared horizontal shafts whereof oneextends outward through an oil-tight bearing in a wall of the base andat the exterior carries a driving wheel; and further including a secondlooper exteriorly of the .base to cooperate with the irst looper and theneedle in the formation of overedge stitching; a separate shaft for theoveredge looper also extending through an oil-tight bearing into theinterior of the base; a four-motion feed element which operates frombeneath through an opening in the work support to intermittently advancethe fabric relative to the needle; a work trimming means operative abovethe work support; an operating connection for the trimming meansextending down through an oil-sealed opening in the base top; a rotaryactuator whereby the needle bar is operated from one of the inter-gearedshafts of the actuating mechanism; and a plurality of rotary actuatorson the other of said inter-geared shafts for separately operating thelooper shafts, for imparting feeding and lift movements to the feedelement, and for imparting movement to the operating connection for thetrimming means.

14. In a sewing machine, a hollow box-like base containing a supply oflubricating oil and closed at the top by a flat horizontal work support;an endwise reciprocating needle bar extending up from within the basethrough an oil-tight bearing in the work support; a needle carried bythe bar above the work support; a looper to cooperate with the needlebeneath the work support; a feed element operative upwardly through anopening in the work support; a presser foot to cooperate with the feedelement from above the work support; work trimming means including aknife operative above the work support; an operating connection for thetrimming knife extending down through an oil-sealed opening in the basetop; actuating mechanism within the base from which the needle bar, thelooper, the feed element and the trimmingmeans all derive theirmovements in properly timed relation; means for lubricating theactuating mechanism from the oil supply within the base; and aretractable protective cover extending over the exposed jortions of theneedle bar, the presser means and the trimming means, said coverproviding clearance beneath one of its side edges to permit traverse 0fthe Work support by the work and a clearance at the front to permitinsertion of the work and to enable observation of the needle, thepresser foot and the trimming knife.

15. In a sewing machine, a frame including a box-like base with a flattop closure whereof a portion serves as a work support; a reciprocatinglneedle bar which extends upward through the top of the base and whichat its protruding end carries a needle for movement down through the!work support; a complemental stitch forming instrumentality to cooperatewith the needle beneath the work support exteriorly of the base; andmechanism within the base and below the plane of the work support foractuating said needle bar and complemental stitch forminginstrumentality including a shaft which extends through an oil-tightbearing in a wall of the base to said instrumentality.

16. In a sewing machine a hollow box-like base with a flat top closureelement whereof a portion serves as a work support; stitch formingmechanism including a needle bar'which extends downwardly through oiltight bearing intothe interior of the base, and which at its protrudingend carries a needle for movement down through the work support, and acomplemental stitch formingA element to cooperate with the needlebeneath the-work support exteriorly of said base; vand actuating meansfor the stitch forming mechanism'including a shaft which is journaledin'an` oil-tight bearing in a wall of the frame. l

17. In a sewing machine a hollow box-like base with a flat top closureelement whereof a portion serves as a work support;y stitch formingmechanism including a needle bar which extends downwardly through an oiltight bearing into the interior of the base andwhich at its protrudingend carriesa needle for movement down through the work support, and acomplemental stitch forming elementto cooperatewith the needle beneaththe workl support exteriorly of said base; and actuating means for thestitch forming mechanism lincluding a rotary shaft wholly within vsaidbase.

18. In a sewing machine a hollow box-likebase with a flat top closureelement whereof a portion serves as a work support; stitch formingmechanism including a needle bar which extends downwardly through an oiltight bearing into the interior of the base and which at itsl protrudingend carries a needle for movement down vthrough the work support, and acomplemental stitch forming element to cooperate with the needle beneaththe work support exteriorly of said base; and actuating means for thestitch forming mechanism including a pair of interconnected rotaryshafts one of which is wholly within said base.

19. In a sewing machine, a closed hollow boxlike base with a removabletop closure means including a work support; stitch forminginstrumentalities including a needle, and cooperating elements atopposite sides of said work support exteriorly of the base; actuatingmeans within the base and operating connections extending up andlaterally through oil-tight bearings in the top and in the wallstructure of said base direct to said instrumentalities from theactuating means.

20. In a sewing machine, a closed hollow boxlike base with a removabletop closure means including a work support; stitch forminginstrumentalities including a needle and cooperating elements atopposite sides of said work support exteriorly of the base; actuatingmechanism within the base and beneath the work support includingoperating connections which extend up and laterally through oil-tightbearings in the top and sides of said base direct to saidinstrumentalities; and a supply of lubricating oil within the base fromwhich vthe moving parts of the actuating mechanism are lubricated bysplash action. i

21. In a sewing machine, a closed hollow boxlike base with a topproviding a work support; cooperating stitch forming instrumentalitiesabove and below the work support exteriorly of the base; directsupporting and operating connections for said stitch forminginstrumentalities extending outward through oil-tight bearingsrespectively provided in the top and in the side wall structure of saidbase; and actuating mechanism for said connections including a rotaryshaft which is wholly disposed within the base.

22. In a sewing machine, a closed hollow boxlike base with a topproviding a work support; cooperating stitch forming instrumentalitiesabove and below the work support exteriorly of said base; directsupporting and operating connections for said stitch forminginstrumentalities extending outward through oil-tight bearingsrespectively provided in the top and in the side wall 'structure of saidbase; and actuating mechanism for said operating connections including apair of shafts which are interconnected for synchronous rotation andwhereof one is wholly contained within said base.

23. In a sewing machine, a frame with a hollow box-like base containinglubricating oil; a cover element which has an oil-tight perimetric sealwith the top of the base and provides a work support; stitch forming,work feeding and trimming instrumentalities, the trimminginstrumentalities comprising a` stationary and a movable cutting bladeexteriorly of the base above and below the work support; actuatingmechanism within the base; operating connections extending throughoil-tight bearings in the cover element and in the wall structure of thebase from the actuating mechanism direct to the stitch forminginstrumentalities; and a link which extends through an: oil-sealedopening in the cover element of the base to the movable blade of thetrimming instrumentalities.

24. In a sewing machine, a frame including a hollow box-like basewhichserves as an oil reservoir; a cover element sealed oil tight withthe top of the base and providing a work support; stitch formingmechanism including a reciprocable needle andv complemental stitchforming instrumentalities located respectively above and below the worksupport; feeding mechanism including a feed dog which operates through aslot in the work. support; means contained within said hollow base foractuating the stitch forming and l 4feedingmechanisms; and connectionsextending outward through oil-tight bearings in the cover element and inthe side wall structure of the base for imparting movement to thecomplemental stitch forming instrumentalities.

25. In a sewing machine,'a, frame including a closed hollow box-likebase with a top providing a work support; stitch forming mechanismincluding a reciprocating needle and complemental stitch forminginstrumentalities positioned in operative relationship exteriorly ofsaid base; dlrect operating means for said needle and said complementalstitch forming means beneath the work support including members whichextend from above and from the side of the base through oil-tightbearings in its wall structure; and partitioning dividing the hollow ofthe base into two compartments in which the operating means for theneedle and for the complemental stitch forming instrumentalities arerespectively housed.

NORMAN V. CHRISTENSEN. GEORGE SAUER. NED WALLENBERG.

